#559EC9
Closest named color: Greyblue (#77A1B5). oklch(66.9% 0.097 236.5), rgb(85, 158, 201).
Aa
Black text reads best on this color (7.12:1).
About this color
#559EC9 is a medium-light, moderately saturated blue. In OKLCH its lightness is 67%, its chroma 0.097 and its hue 237°. Its hue sits on the cool side of the wheel. The nearest named color is Greyblue (#77A1B5), ΔE 0.047 away. Black text reads best on it, at 7.12:1.
| Hue family | Blues |
| Lightness | medium-light (67%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Greyblue (#77A1B5) |
| Black text | 7.12:1 |
| White text | 2.94:1 |
Values
| HEX | #559EC9 |
| RGB | rgb(85, 158, 201) |
| HSL | hsl(202, 52%, 56%) |
| OKLCH | oklch(66.9% 0.097 236.5) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #559EC9 | 2.94:1 | Fails | Lc -61.1 | Content text, not long reading |
| Black text on #559EC9 | 7.12:1 | AAA | Lc 48.2 | Large or bold text, headings |
| #559EC9 text on white | 2.94:1 | Fails | Lc 55.8 | Large or bold text, headings |
| #559EC9 text on black | 7.12:1 | AAA | Lc -46.0 | Large or bold text, headings |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 400.
-
Step 50
50
#F1F6FA
oklch(97.1% 0.008 241.7)
-
Step 100
100
#DFECF4
oklch(93.6% 0.018 234.5)
-
Step 200
200
#C5DDED
oklch(88.5% 0.034 237)
-
Step 300
300
#9CC7E3
oklch(80.8% 0.06 237)
-
Step 400
400 (this color)
#559EC9
oklch(66.9% 0.097 236.5)
-
Step 500
500
#2894CA
oklch(63.2% 0.123 236.1)
-
Step 600
600
#007CB0
oklch(55.5% 0.121 236.7)
-
Step 700
700
#006895
oklch(49% 0.107 237)
-
Step 800
800
#00557B
oklch(42.6% 0.093 237.2)
-
Step 900
900
#024767
oklch(37.7% 0.081 237)
-
Step 950
950
#072A3C
oklch(27% 0.051 235.9)
#559EC9 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #8A9DCB | 0.058 |
| Deuteranopia (no green cones) | #7A91C8 | 0.050 |
| Tritanopia (no blue cones) | #00A9AC | 0.073 |
| Achromatopsia (no color) | #969696 | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #559EC9
#559EC9
oklch(66.9% 0.097 236.5)
- #C38558
#C38558
oklch(67% 0.098 56.2)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #559EC9, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Greyblue #77A1B5 ΔE 0.047
- Faded Blue #658CBB ΔE 0.049
- Silver Lake Blue #778DA9 ΔE 0.062
- Cadet Blue #5F9EA0 ΔE 0.062
- Turquoise Blue #06B1C4 ΔE 0.063
- Bluegrey #85A3B2 ΔE 0.064
- Blue Grey #758DA3 ΔE 0.066
- Bluey Grey #89A0B0 ΔE 0.067
Use #559EC9 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.